WO1982003848A1 - Procede et dispositif pour la fabrication de sulfate de calcium anhydre synthetique et d'acide fluorhydrique pur - Google Patents
Procede et dispositif pour la fabrication de sulfate de calcium anhydre synthetique et d'acide fluorhydrique pur Download PDFInfo
- Publication number
- WO1982003848A1 WO1982003848A1 PCT/CH1981/000146 CH8100146W WO8203848A1 WO 1982003848 A1 WO1982003848 A1 WO 1982003848A1 CH 8100146 W CH8100146 W CH 8100146W WO 8203848 A1 WO8203848 A1 WO 8203848A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- stage
- column
- reaction
- reactor
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
- C01B7/195—Separation; Purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
- C01B7/192—Preparation from fluorspar
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
Definitions
- Synthetic anhydrite is a sought-after raw material in countries that have insufficient natural gypsum deposits. It forms an excellent additive for cement production and is also often used for the production of floor coverings and panels with embedded heating coils. However, the prerequisite is that the necessary purity is achieved during production in order to avoid disruptive effects in the cement kiln or when the anhydrite gypsum has set or subsequent blooming. A low fluoride content is very desirable for cement production, which is why the synthetic anhydrite that can be produced in the simultaneous production of pure hydrofluoric acid is particularly sought after.
- the task is to produce a synthetic anhydrite that only contains the desired small proportion of CaF 2 , while the free H 2 SO 4 is completely neutralized, but other desired stimulators are already present.
- the reaction between the fluoride and the sulfuric acid should be carried out in a stoichiometric ratio if possible or with only a very small excess of sulfuric acid. There is also the requirement that the reaction be carried out at temperatures which are not too high, in order not to subject the anhydrite which is formed to thermal stress.
- the reaction should be carried out in such a way that no or only very small amounts of fluorosulphonic acid get into the reactor and that the renewed formation of fluorosulphonic acid is also effectively suppressed therein.
- the components CaF 2 and mixed acid should be added to the reactor so hot and the reactor inlet heated so that the reaction starts at above 100 ° C., which prevents new formation of fluorosulphonic acid.
- the gases escaping from the reactor should initially be in In a first stage, they are dried hot and dust-free before they are cooled in further stages.
- the washing acid with a fairly high fluorosulfone content which flows back only slightly warmed from the final absorption stage, is heated in a small separation column to such an extent that the fluorosulfonic acid is split and the resulting HF gas can be fed directly to the second purification stage before it is now on H 2 SO 4 concentrated and hot washing acid is added to the reaction acid.
- the process according to the invention in which flux paste is reacted with a mixture of sulfuric acid, oleum and reflux of the acidic washes, consists in the acid mixture which is fed into a three-stage reactor being heated to temperatures of 100-200 ° C., preferably 150-100 ° C. Is preheated to 160 ° C., so that only very small amounts of fluorosulphonic acid enter the reactor and the fluorosulphonic acid does not form again in it.
- the amount of fussic acid in the acid mixture which flows to the reactor for the reaction can be reduced to a minimum, which is determined by the solubility of the remaining hydrofluoric acid in the acid mixture.
- FIG. 1 shows a schematic example of the process sequence according to the invention
- FIG. 2 shows an enlarged detail from FIG. 1 with a variant
- FIG. 3 shows a reaction diagram to illustrate the progress achieved compared to conventional processes.
- the process for the production of synthetic anhydrite comprises the following steps:
- Flow pat 1 is heated in a centrifugal dryer 4 and is fed hot via a collecting bunker 5 into a scale bunker 6. From this it is conveyed via a metering element 7 through line 8 into a mixing and kneading device 11 forming the first reaction stage.
- the relatively slow-running mixing and kneading device 11 with drive 12 performs a rotating and simultaneously reciprocating movement with the worm shaft, which has an interrupted worm gear, the interruptions and the worm gear interacting with kneading chicanes inserted in the housing.
- a hot acid mixture is injected through the line 10 behind the spatula in the outlet direction and mixed intensively with the still hot spatula and reacted at about 120-160 ° C., preferably 130 ° C.
- About 70% of the conversion reaction is already complete when the reaction product in the moist, crumbly state is expelled from the subsequent single-shaft mixer, which forms the second reaction stage.
- the single-screw machine 13 is equipped with impact paddles, is heated on the outside and has a drive 14.
- the speed of the single-screw machine is significantly higher than that of the mixing and kneading device 11 of the first stage.
- the paddles subdue the property of one Impact stress and promote it to the third reaction stage.
- the third reaction stage is formed by an externally heated rotary kiln 15, which only rotates at approx.
- the rotary kiln 15 is heated from the inlet end to the outlet from 200 ° C - approx. 300 ° C increasing.
- the discharge of the contaminated HF gases is arranged in the furnace shield or in the chute 28.
- the anhydrite passes through a fine mill 20 and is bunkered before it is bagged at 60 or loaded into containers. If the anhydrite is not to be used as a cement retarder but as a high-quality building material, it is advantageous to add approx. 0.4 to 0.7% K2SO 4 as a stimulator. Although this does not take part in the reaction, it distributes it extremely finely in the anhydrite.
- hydrofluoric acid that is produced during the production of anhydrite is another valuable product, provided that it is produced economically with the required purity.
- the hydrofluoric vapors escaping through the line 16 from the three-part reactor system kept under a slight negative pressure are still heavily contaminated by Dust, SO 2 , CO2 1.4% false air 1.6% water vapor 2.4% H 2 SO 4 4.4%
- HF gases which are loaded with water vapor and with low-volatility impurities and have a temperature of approximately 180 ° C.
- a column designed as a dryer 31 where cold or chilled acid mixtures trickle down at around 18 ° to 80 ° C, on average around 70 ° C, which absorb the water vapor and wash out the dust.
- part of the HF bound as HSO 3 F is already split off by the hot gases or its formation is suppressed.
- the HF-enriched gases now rise at 40 to 70 ° C in the upper part 33 of the column, where they are sprayed from the head with 17 ° C cold HF. This removes further impurities and gets into the lower part.
- the gas mixture is cooled to approximately 22 ° C. and thus leaves the upper part 33 of the column.
- the gas mixture passes into a condenser 34 cooled with approx. 10 ° C. water, where a part is condensed and collected in the container 38.
- This part is pumped back into the head 33 of the column by a circulation pump 27.
- a further quantity of the gases arrives at about 17 ° C. in a second condenser 36 which is cooled with brine, so that the condensates flow off into another container 38 at 9 ° C. For this they can be pumped with the attached pump 27 nit better than 99.5% HF purity via line 40 into a storage container. For many this purity is sufficient for technical applications.
- the acid can still be pumped into the rectification column 41, where the remaining volatile impurities are still driven off with a little HF and an HF of more than 99.99% is drawn off from the bottom and through the cooler 44 to 10 ° C cooled through line 45 to the storage tank.
- the exhaust air blown out by the fan 59 contains only less than 0.01% HF before the exhaust stack is diluted.
- the Condensation is set so that the residual gases mixed with lower-boiling impurities are passed as approx. 80% HF from approx. 9-12 ° C. and approx. 800 kg / h into the absorption tower 51, where approx. 720 kg / h 18 ° C. cold 98% ige sulfuric acid 23 are added.
- approx. 280 kg / h of gases leave the absorption tower, whereby the HF content has dropped below 30% and the air content is approx. 20%.
- About 1290 kg / h of washing acid at 18 ° C. run back from the absorption tower 51 into the middle part of the washing column 33.
- the washing acid passed through line 54 contains about 40% HF, about 60% H 2 SO 4 and 1-3% water as an impurity.
- the washing acid in the sump 31 of the washing column however, only has a content of less than 12% HF.
- approximately 3040 kg / h of hydrofluoric acid are branched off at approximately 9 ° C. and pumped into the rectification column 41.
- about 3000 kg / h of hydrofluoric acid are drawn off at 52 ° C. with a purity of more than 99.99%, while about 44 kg / h of impurities of about 47 ° C. go out gaseously at the top of the column at 50 ′.
- the addition of fresh 20 ° C cold sulfuric acid 23 with 98% to the absorption tower 51 allows the condensation and distillation stages to be advantageously charged, since there is no need to regulate the separation of the uncondensable impurities from the HF at the top of the columns or in the condensation too critically.
- the concentrated HF vapors are drawn off at the top at more than about 150.degree introduced, the concentrated sulfuric acid 30 enriched in the bottom of the column is fed to the acid mixing tank 9 at about 150 ° C.
- the HF content in the mixed acid 10 thus drops to below 1% and this is fed to the reactor 11 at approximately 140 ° C.
- Fig. 2 shows a variant. This assumes that according to the diss. Kaiser, ETH (1964) the boiling equilibrium between HF contaminated with dust, SO 2 , SO 3 , Si F4 etc. can be managed in such a way that the formation of HSO 3 F from HF + H 2 SO 4 is omitted. As is well known, this is the case at temperatures above 100'0C. Already at approx. 80 ° C only 1/7 of the compound is formed, the rest of the undesirable does not occur. Critical in the process are the drying of the reaction gases escaping from the third reactor stage 15 through line 16 at about 180 ° C., ie their removal from entrained dust and H 2 O.
- Fig. 3 shows with curve 46 how in the previous practice with recycled mixed acid, which contained about 15% HFSO 3 , only about 39% conversion was achieved at about 100 ° C after about 3 minutes of Khet mixing time, which during the up to Total funding of approximately 5 minutes through the second reaction stage 13 rose to a total of only 45%.
- curve 47 is achieved.
- 70% of the possible HF gas was developed in about 3 minutes, while in the subsequent second stage 13 the reaction continued up to about 75% in a total of 5 minutes.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Treating Waste Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP50008882A JPS58500561A (ja) | 1981-04-28 | 1981-12-21 | 合成硬石膏および純フツ化水素酸を製造する方法および装置 |
BR8109005A BR8109005A (pt) | 1981-04-28 | 1981-12-21 | Processo e instalacao para a preparacao de anidrita sintetica e de acido fluoridrico puro |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH274581A CH646401A5 (de) | 1981-04-28 | 1981-04-28 | Verfahren und einrichtung zur herstellung von synthetischem anhydrit und reiner flusssaeure. |
CH2745/81810428 | 1981-04-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1982003848A1 true WO1982003848A1 (fr) | 1982-11-11 |
Family
ID=4240653
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH1981/000146 WO1982003848A1 (fr) | 1981-04-28 | 1981-12-21 | Procede et dispositif pour la fabrication de sulfate de calcium anhydre synthetique et d'acide fluorhydrique pur |
Country Status (7)
Country | Link |
---|---|
US (1) | US4460551A (fr) |
EP (1) | EP0077331B2 (fr) |
AU (1) | AU546040B2 (fr) |
BR (1) | BR8109005A (fr) |
CH (1) | CH646401A5 (fr) |
DE (1) | DE3152830D2 (fr) |
WO (1) | WO1982003848A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0551838A2 (fr) * | 1992-01-15 | 1993-07-21 | Solvay Fluor und Derivate GmbH | Traitement d'une phase d'acide fluorhydrique des mélanges réactionnels |
EP0968960A1 (fr) * | 1998-05-28 | 2000-01-05 | Solvay Fluor und Derivate GmbH | Recyclage d'agent d'enlèvement de flux |
CN102556973A (zh) * | 2012-02-22 | 2012-07-11 | 中南大学 | 一种以萤石为原料生产氢氟酸的方法 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4935211A (en) * | 1989-01-23 | 1990-06-19 | Azar David G | Fluorogypsum waste solidification material |
US5271918A (en) * | 1991-03-11 | 1993-12-21 | Alliedsignal Inc. | Furnace gas - sulfuric acid contact process for HF manufacture |
US6668947B2 (en) * | 2001-09-25 | 2003-12-30 | Ramon Perez Cordova | Drill cutting treatment method |
MXPA04008316A (es) * | 2002-02-27 | 2004-11-26 | Racional Energy & Environment | Metodo y aparato de tratamiento de detritos de perforacion. |
EP2118000B1 (fr) * | 2007-02-02 | 2011-05-25 | Solvay Fluor GmbH | Préparation de fluorure d'hydrogène à partir de fluorure de calcium et d'acide sulfurique |
US9334436B2 (en) | 2010-10-29 | 2016-05-10 | Racional Energy And Environment Company | Oil recovery method and product |
US8356678B2 (en) | 2010-10-29 | 2013-01-22 | Racional Energy & Environment Company | Oil recovery method and apparatus |
DE102011111316B4 (de) | 2011-08-26 | 2017-10-19 | Plinke Gmbh | Verfahren zur Reinigung und Konzentrierung HF-haltiger Schwefelsäure |
DE102018102026A1 (de) * | 2018-01-30 | 2019-08-01 | Duesenfeld Gmbh | Verfahren zum Verwerten von Lithium-Batterien |
CN108147439A (zh) * | 2018-02-12 | 2018-06-12 | 沈阳鑫博工业技术股份有限公司 | 一种利用菱镁矿粉和萤石制备氟化镁的装置及方法 |
CN109437111A (zh) * | 2018-12-14 | 2019-03-08 | 福建龙氟化工有限公司 | 一种高纯无水氟化氢生产工艺及配套的回转反应炉 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH540195A (de) * | 1970-09-30 | 1973-09-30 | Buss Ag | Verfahren zur kontinuierlichen Herstellung reiner Flusssäure und Einrichtung zur Ausübung des Verfahrens |
FR2279664A1 (fr) * | 1974-07-24 | 1976-02-20 | Bayer Ag | Production de fluorure d'hydrogene et de sulfate de calcium |
CH617641A5 (en) * | 1975-04-18 | 1980-06-13 | List Heinz | Process for preparing hydrofluoric acid |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2753245A (en) * | 1949-08-13 | 1956-07-03 | Pennsylvania Salt Mfg Co | Production of hydrogen fluoride |
IT649940A (fr) * | 1960-05-23 | |||
GB999137A (en) * | 1960-07-21 | 1965-07-21 | I C P M Ind Chimiche Porto Mar | Process for the production of hydrofluoric acid |
DE1567778B1 (de) * | 1965-04-20 | 1970-07-23 | Riedel De Haen Ag | Verfahren zur Herstellung von im wesentlichen schwefelfreier Flusssaeure |
DE2209960C3 (de) * | 1972-03-02 | 1979-10-11 | Bayer Ag, 5090 Leverkusen | Verfahren zur Aufarbeitung von Fluorwasserstoff-haltigen Rohgasen der Flußsäureherstellung |
US4150102A (en) * | 1975-10-02 | 1979-04-17 | Bayer Aktiengesellschaft | Purifying hydrofluoric acid |
DE2601654A1 (de) * | 1976-01-17 | 1977-07-21 | Bayer Ag | Verfahren zur herstellung von flusssaeure aus phosphathaltigem flusspat |
-
1981
- 1981-04-28 CH CH274581A patent/CH646401A5/de not_active IP Right Cessation
- 1981-12-21 AU AU79308/82A patent/AU546040B2/en not_active Ceased
- 1981-12-21 DE DE81CH8100146T patent/DE3152830D2/de not_active Expired
- 1981-12-21 WO PCT/CH1981/000146 patent/WO1982003848A1/fr active IP Right Grant
- 1981-12-21 EP EP82900014A patent/EP0077331B2/fr not_active Expired - Lifetime
- 1981-12-21 BR BR8109005A patent/BR8109005A/pt unknown
- 1981-12-28 US US06/456,090 patent/US4460551A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH540195A (de) * | 1970-09-30 | 1973-09-30 | Buss Ag | Verfahren zur kontinuierlichen Herstellung reiner Flusssäure und Einrichtung zur Ausübung des Verfahrens |
FR2279664A1 (fr) * | 1974-07-24 | 1976-02-20 | Bayer Ag | Production de fluorure d'hydrogene et de sulfate de calcium |
CH617641A5 (en) * | 1975-04-18 | 1980-06-13 | List Heinz | Process for preparing hydrofluoric acid |
Non-Patent Citations (1)
Title |
---|
See also references of EP0077331A1 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0551838A2 (fr) * | 1992-01-15 | 1993-07-21 | Solvay Fluor und Derivate GmbH | Traitement d'une phase d'acide fluorhydrique des mélanges réactionnels |
US5300709A (en) * | 1992-01-15 | 1994-04-05 | Solvay Fluor And Derivate Gmbh | Process for working up a hydrogen fluoride phase from a fluorination reaction mixture |
EP0551838A3 (en) * | 1992-01-15 | 1994-05-18 | Solvay Fluor & Derivate | Treatment of the hydrogen fluoride-phase from reaction mixtures |
EP0968960A1 (fr) * | 1998-05-28 | 2000-01-05 | Solvay Fluor und Derivate GmbH | Recyclage d'agent d'enlèvement de flux |
US6207125B1 (en) | 1998-05-28 | 2001-03-27 | Solvay Fluor Und Derivate Gmbh | Recycling of flux material |
CN102556973A (zh) * | 2012-02-22 | 2012-07-11 | 中南大学 | 一种以萤石为原料生产氢氟酸的方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0077331A1 (fr) | 1983-04-27 |
US4460551A (en) | 1984-07-17 |
AU7930882A (en) | 1982-12-07 |
DE3152830D2 (en) | 1983-04-07 |
EP0077331B1 (fr) | 1985-08-07 |
BR8109005A (pt) | 1983-04-12 |
EP0077331B2 (fr) | 1991-01-23 |
AU546040B2 (en) | 1985-08-08 |
CH646401A5 (de) | 1984-11-30 |
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